The Spice-style junction diode for BJTs is a regular diode without heat generation. A separate model was needed to implement the Level parameter, as the Ebers-Moll model doesn't recognize the Area parameter. A heat port was still needed, as the model makes use of the device temperature that it imports through the heat port. However, the heat flow itself is zero, as the model is used only as a mathematical construct to compute the currents of the non-linear current sources. The heat generation is accounted for in the non-linear sources.
Parameters:
IS: Transport saturation current (default value = 1e-16 Amp)
EG: Energy gap for temperature effect on saturation current (default value = 1.11 Volt)
N: Current emission coefficient (default value = 1)
XTI: Saturation current temperature exponent (default value = 3)
Area: Relative area occupied by the diode (default value = 1)
Level: Transistor modeling level (Ebers-Moll = 1; Gummel-Poon = 2) (default = 2)
EMin: if x < EMin, the exp(x) function is linearized (default value = -100)
EMax: if x > EMax, the exp(x) function is linearized (default value = 40)
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